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Cost Of Contracts (Detail) (USD $)
In Millions, unless otherwise specified
Apr. 05, 2015
Dec. 31, 2014
Contractors [Abstract]    
Contract costs and estimated profits $ 7,390gd_ContractCostsAndEstimatedProfits $ 7,494gd_ContractCostsAndEstimatedProfits
Other contract costs 1,061gd_OtherContractCosts 1,064gd_OtherContractCosts
Costs in excess of billings on uncompleted contracts or programs, total 8,451us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms 8,558us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
Advances and progress payments (4,007)us-gaap_CustomerAdvancesAndProgressPaymentsForLongTermContractsOrPrograms (3,967)us-gaap_CustomerAdvancesAndProgressPaymentsForLongTermContractsOrPrograms
Total contracts in process $ 4,444gd_ContractsInProcess $ 4,591gd_ContractsInProcess